>> feel fine, feel fine and then don't feel fine. >> reporter: usually too much sun and too little water. one family rushed their 85-year- old mom, in pale and faint. >> i asked her the question, like, does she know where she is at and does she know what day it is? little slow, but she answered correctly. >> if they have underlying medical conditions sometimes the heat can make that worse and maybe that is a little unexpected. >> reporter: all over the bay area, folks found ways to cool off, but when the bbq called, they rose to duty. >> it's about 110 with the grill going on. it's very hot and i'm sweatings you see. >> reporter: tomorrow, grilling with lighter fluid is frowned on, along with nonessential car trips, but transit options shrink on holidays and many plans are. >> we we're calling this one day at a time at this point, but it does look like a 4th of july looks like another library spare-the-air day, but we'll know tomorrow at 10:00.